[people/ms/u-boot.git] / tools / getline.c

/* getline.c -- Replacement for GNU C library function getline

Copyright (C) 1993, 1996, 2001, 2002 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

/* Written by Jan Brittenson, bson@gnu.ai.mit.edu.  */

#include <assert.h>
#include <stdio.h>

/* Always add at least this many bytes when extending the buffer.  */
#define MIN_CHUNK 64

/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
   + OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
   malloc (or NULL), pointing to *N characters of space.  It is realloc'd
   as necessary.  Return the number of characters read (not including the
   null terminator), or -1 on error or EOF.
   NOTE: There is another getstr() function declared in <curses.h>.  */
static int getstr(char **lineptr, size_t *n, FILE *stream,
		  char terminator, size_t offset)
{
	int nchars_avail;	/* Allocated but unused chars in *LINEPTR.  */
	char *read_pos;		/* Where we're reading into *LINEPTR. */
	int ret;

	if (!lineptr || !n || !stream)
		return -1;

	if (!*lineptr) {
		*n = MIN_CHUNK;
		*lineptr = malloc(*n);
		if (!*lineptr)
			return -1;
	}

	nchars_avail = *n - offset;
	read_pos = *lineptr + offset;

	for (;;) {
		register int c = getc(stream);

		/* We always want at least one char left in the buffer, since we
		   always (unless we get an error while reading the first char)
		   NUL-terminate the line buffer.  */

		assert(*n - nchars_avail == read_pos - *lineptr);
		if (nchars_avail < 2) {
			if (*n > MIN_CHUNK)
				*n *= 2;
			else
				*n += MIN_CHUNK;

			nchars_avail = *n + *lineptr - read_pos;
			*lineptr = realloc(*lineptr, *n);
			if (!*lineptr)
				return -1;
			read_pos = *n - nchars_avail + *lineptr;
			assert(*n - nchars_avail == read_pos - *lineptr);
		}

		if (c == EOF || ferror (stream)) {
			/* Return partial line, if any.  */
			if (read_pos == *lineptr)
				return -1;
			else
				break;
		}

		*read_pos++ = c;
		nchars_avail--;

		if (c == terminator)
			/* Return the line.  */
			break;
	}

	/* Done - NUL terminate and return the number of chars read.  */
	*read_pos = '\0';

	ret = read_pos - (*lineptr + offset);
	return ret;
}

int getline (char **lineptr, size_t *n, FILE *stream)
{
	return getstr(lineptr, n, stream, '\n', 0);
}
Commit	Line	Data
64b15021 MF	1	/* getline.c -- Replacement for GNU C library function getline
	2
	3	Copyright (C) 1993, 1996, 2001, 2002 Free Software Foundation, Inc.
	4
	5	This program is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU General Public License as
	7	published by the Free Software Foundation; either version 2 of the
	8	License, or (at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful, but
	11	WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; if not, write to the Free Software
	17	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	18
	19	/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
	20
	21	#include <assert.h>
	22	#include <stdio.h>
	23
	24	/* Always add at least this many bytes when extending the buffer. */
	25	#define MIN_CHUNK 64
	26
	27	/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
	28	+ OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
	29	malloc (or NULL), pointing to *N characters of space. It is realloc'd
	30	as necessary. Return the number of characters read (not including the
	31	null terminator), or -1 on error or EOF.
	32	NOTE: There is another getstr() function declared in <curses.h>. */
	33	static int getstr(char *lineptr, size_t n, FILE *stream,
	34	char terminator, size_t offset)
	35	{
	36	int nchars_avail; /* Allocated but unused chars in LINEPTR. /
	37	char read_pos; / Where we're reading into LINEPTR. /
	38	int ret;
	39
	40	if (!lineptr \|\| !n \|\| !stream)
	41	return -1;
	42
	43	if (!*lineptr) {
	44	*n = MIN_CHUNK;
	45	lineptr = malloc(n);
	46	if (!*lineptr)
	47	return -1;
	48	}
	49
	50	nchars_avail = *n - offset;
	51	read_pos = *lineptr + offset;
	52
	53	for (;;) {
	54	register int c = getc(stream);
	55
	56	/* We always want at least one char left in the buffer, since we
	57	always (unless we get an error while reading the first char)
	58	NUL-terminate the line buffer. */
	59
	60	assert(n - nchars_avail == read_pos - lineptr);
	61	if (nchars_avail < 2) {
	62	if (*n > MIN_CHUNK)
	63	n = 2;
	64	else
65	*n += MIN_CHUNK;
66
67	nchars_avail = n + lineptr - read_pos;
68	lineptr = realloc(lineptr, *n);
69	if (!*lineptr)
70	return -1;
71	read_pos = n - nchars_avail + lineptr;
72	assert(n - nchars_avail == read_pos - lineptr);
73	}
74
75	if (c == EOF \|\| ferror (stream)) {
76	/* Return partial line, if any. */
77	if (read_pos == *lineptr)
78	return -1;
79	else
80	break;
81	}
82
83	*read_pos++ = c;
84	nchars_avail--;
85
86	if (c == terminator)
87	/* Return the line. */
88	break;
89	}
90
91	/* Done - NUL terminate and return the number of chars read. */
92	*read_pos = '\0';
93
94	ret = read_pos - (*lineptr + offset);
95	return ret;
96	}
97
98	int getline (char *lineptr, size_t n, FILE *stream)
99	{
100	return getstr(lineptr, n, stream, '\n', 0);
101	}